API (EMS) - Possible to delete a subscription?

Hi - I'm trying to delete a subscription using this endpoint (after verifying the subscription exists by executing the comparable GET):

Method: DELETE
Endpoint: /api/Subscription/~194|PAC

Response: 403 (Forbidden) - Does not have required permission. (O)

Since I'm getting a 403, I'm interpreting that to mean the endpoint/method are valid, but maybe I just can't delete this subscription. But wanted to check - is this a functional method/endpoint? Thanks!